Cronitor monitors cron job execution timing and whether endpoints respond to health pings. It can tell you if your webhook processing job didn't run on schedule, or if your server returned a 200 to a synthetic request. But it has no access to Stripe, Shopify, or GitHub delivery logs — it cannot tell you whether a specific webhook delivery succeeded or failed. Webhook Guardian reads those delivery logs directly, detecting real delivery failures within 5 minutes.
Cronitor vs Webhook Guardian: Cron Job Timing vs Webhook Delivery Outcome Monitoring
Cronitor and Webhook Guardian are sometimes compared because both sit in the "is my background processing working?" category. But they measure fundamentally different things — and the gap between those measurements is where critical failures hide.
Here is exactly what each tool monitors, why one cannot substitute for the other, and when you might want both.
What Is Cronitor?
Cronitor is a cron job monitoring and uptime tool. Its primary function is tracking whether scheduled jobs execute on time. You wrap a cron job with a Cronitor telemetry command: it pings Cronitor when the job starts and when it finishes. If Cronitor does not see the expected ping within the scheduled window, it fires an alert — your cron job missed its run.
Cronitor also offers endpoint monitoring: it periodically sends HTTP requests to a URL and checks whether the response is a 2xx. This tells you "the server is up and responding to requests." Teams use Cronitor to monitor billing sync jobs, data pipeline jobs, email digest jobs, and any other scheduled background task where missed executions have business consequences.
What Is Webhook Guardian?
Webhook Guardian is a webhook delivery outcome monitor. It connects to Stripe, Shopify, and GitHub via read-only OAuth and polls the delivery logs those platforms maintain for every webhook attempt — capturing the HTTP status code Stripe received from your endpoint, the timestamp, the retry count, and whether Stripe ultimately marked the delivery as failed.
When Webhook Guardian detects a failed delivery in those logs, it sends an alert within 5 minutes via Slack or email — with the event type, error code, retry count, and a one-click replay link. Setup takes approximately 2 minutes and costs $29/month. No agents, no instrumentation, no code changes.
Why Does a Passing Cronitor Check Not Mean Your Webhooks Are Healthy?
This is the core distinction, and it matters more than it might initially appear.
Cronitor's endpoint check sends a synthetic HTTP request to your webhook URL and verifies that your server returns a 2xx. If your server is running and responding, Cronitor reports green. But Cronitor has no idea what Stripe has been sending to that endpoint, or whether those deliveries have been succeeding.
Consider this failure scenario: your webhook handler has a bug that causes it to return a 500 specifically when processing invoice.payment_failed events — the ones your dunning logic depends on. Cronitor's synthetic ping does not send a real Stripe event payload, so it receives 200 as usual. Cronitor reports green. Meanwhile, in Stripe's delivery log, every invoice.payment_failed delivery for the past two weeks has been marked failed. Your dunning emails have not been sent. Cronitor had no visibility into any of it.
Webhook Guardian reads Stripe's delivery log directly. It would have alerted on the first failure within 5 minutes.
What Does Cronitor Monitor That Webhook Guardian Does Not?
Cronitor covers failure modes that Webhook Guardian does not:
- Cron job timing — if your Stripe webhook processing job is scheduled to run every hour and it stops running (the server crashed, the container was evicted, the scheduler broke), Cronitor detects the missed execution. Webhook Guardian only reads delivery logs from the platform side and cannot tell you whether your processing jobs are running.
- Broad endpoint uptime — if your webhook endpoint goes completely offline and returns no response at all, Cronitor's uptime check catches that independently. Webhook Guardian will also detect this (via the failures Stripe records when it cannot reach your endpoint), but Cronitor may surface it faster for infrastructure-level outages.
- Non-webhook scheduled work — any cron job that is not related to webhook processing (nightly billing reconciliation, daily report generation, data exports) falls entirely outside what Webhook Guardian can monitor.
How Do Cronitor and Webhook Guardian Compare Feature by Feature?
| Feature | Webhook Guardian | Cronitor |
|---|---|---|
| Setup time | ~2 minutes | ~10 minutes (add telemetry pings to your cron jobs) |
| What it monitors | Stripe, Shopify, GitHub webhook delivery outcomes | Cron job execution timing and endpoint uptime |
| Reads platform delivery logs | ✓ Yes — directly via read-only OAuth | ✗ No — cannot access Stripe/Shopify/GitHub delivery logs |
| Cron schedule monitoring | ✗ Not applicable | ✓ Yes — core feature |
| Endpoint uptime | ✗ Not applicable | ✓ Yes — synthetic HTTP checks |
| Webhook delivery failures | ✓ Yes — reads actual delivery outcomes from source | ✗ No — a healthy ping does not equal a successful delivery |
| Replay failed webhooks | ✓ One-click replay link in every alert | ✗ Not applicable |
| Cost | From $29/month | Free tier available; paid plans from ~$29/month |
When Should You Use Cronitor Without Webhook Guardian?
Cronitor alone is sufficient when:
- You do not use Stripe, Shopify, or GitHub webhooks in any revenue-critical or operationally critical path
- Your primary monitoring concern is whether scheduled background jobs run on time
- You want basic endpoint uptime checks without needing delivery-level detail
When Should You Use Webhook Guardian Without Cronitor?
Webhook Guardian alone is sufficient when:
- Webhook delivery failures are your primary concern and you have separate infrastructure monitoring in place
- You need to catch delivery failures that Cronitor's synthetic checks will never see — event-type-specific errors, platform-side timeouts, partial failures in a multi-endpoint webhook setup
- You want every failed delivery to include a one-click replay link in the alert, not just a status notification
Is There a Case for Running Both Cronitor and Webhook Guardian?
Yes. They cover non-overlapping failure modes. Cronitor tells you "your infrastructure is up and your jobs are running on schedule." Webhook Guardian tells you "Stripe, Shopify, and GitHub are successfully delivering webhooks to your endpoints." Both can be true — or either can fail independently. Teams that process revenue-critical webhooks and run scheduled background jobs often find that both tools are earning their keep.
What Is the Core Difference Between Cronitor and Webhook Guardian?
Cronitor checks execution timing and endpoint health — it answers "did the job run?" and "does the URL respond?" Webhook Guardian checks webhook delivery outcomes from the source platform's own log — it answers "did Stripe successfully deliver this specific event?" These are different questions, and a 200 response to a synthetic ping is not an answer to the second one.
FAQ: Cronitor vs Webhook Guardian
Can Cronitor detect a failed Stripe webhook delivery?
What is Cronitor good for vs Webhook Guardian?
Do I need both Cronitor and Webhook Guardian?
Monitor what Cronitor cannot see — actual webhook delivery outcomes from Stripe, Shopify, and GitHub. Start a free 14-day trial and connect your first platform via read-only OAuth in about 2 minutes.
Also comparing: Webhook Guardian vs Better Uptime. Learn more in the webhook monitoring guide or see how webhook failures affect CI/CD pipelines.